燃气轮机转子动力特性分析的旋转对称有限元模型

A ROTATIONAL SYMMETRY FINITE ELEMENT MODEL OF GAS TURBINE ROTOR IN CHARACTERISTICS ANALYSIS

本文给出了燃气轮机转子临界转速和不平衡响应计算分析的旋转对称有限元模型，付立叶级数的引入可以使得三维转子只在一个基础扇区上使用三维单元建立有限元模型。与梁单元相比，实体单元能准确描述转子的几何形状。文中给出了一个验证性算例和一个工程实例。

A rotational symmetry finite element model is provided to calculate gas turbine shaft critical speeds and unbalance response analysis.A Fourier series representation allows the three-dimensional shaft geometry to be modeled in a basic section by using three-dimensional element.Unlike a beam element model,a solid element representation allows the actual rotor geometry to be modeled.A matrix reduction technique is used to reduce the degrees of freedom.An engineering example of marine gas turbine rotor is applied to the verification of the provided model.